PRESERVATION OF FRUITS AND VEGETABLES BY REDUCTION OF ETHYLENE GAS
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1 PRESERVATION OF FRUITS AND VEGETABLES BY REDUCTION OF ETHYLENE GAS Presented By: David M. Webster CEO AgraCo Technologies International, LLC Source: Cornell University College of Agricultural and Life Sciences Horticulture Department
2 WHAT DEFINES PRODUCE QUALITY? Color Size & Shape Freedom from blemishes Texture (appropriate to product/variety) Flavor Nutritional quality Absence of chemical contamination Absence of Bio-contamination (bacteria, mold, fungus)
3 HOW DO YOU MAINTAIN QUALITY? Quality cannot be improved after harvest you can only slow down the rate of deterioration by managing the factors that accelerate post-harvest deterioration.
4 Preservation Keys: Reduce Respiration Rate Minimize Ethylene Production Reduce Transpiration and Water Loss Prevent Physical Damage Eliminate Pathogens
5 Preservation Basics: Use refrigeration to reduce metabolic rates (respiration) of processes that result in undesirable changes in color, composition, texture, flavor and nutritional status; Reduce water loss that can result in loss of weight, shriveling, softening, loss of crispness and nutritional status; Minimize bruising, friction damage and other mechanical injuries; Prevent development of physiological and pathological disorders; Remove ethylene gas from storage spaces.
6 FACTORS TO BE MANAGED Respiration Rate Temperature Physical and Physiological Factors Exposure to Ethylene Gas
7 RESPIRATION Carbohydrate + O 2 CO 2 + energy + heat High = bad Low = good Therefore, controlling respiration rates should be a focus of every postharvest activity
8 Rate of Deterioration Is Generally Proportional To Respiration Rate Respiration Rate Range at 41 F (mg CO 2 /kg-hr) Commodity examples Very low <5 Dried vegetables, nuts Low 5-10 Celery, potato, pumpkin Moderate Cabbage, carrot (w/o tops), tomato High Carrot (w tops), cauliflower, lima bean Very high Artichoke, bean spouts, broccoli Extremely high >60 Asparagus, mushroom, parsley, peas
9 TEMPERATURE CONTROL Cold Chain Management Cooling reduces: Respiration rates Effects of ethylene Moisture loss Decay development Pathogen development Progression of injuries Extends storage and market life
10 Non-Chilling sensitive Chilling sensitive Apple Artichoke Asparagus Beans, lima Broccoli Cabbage Cauliflower Sweet corn Grape Lettuce Mushrooms Peas Peach Spinach Avocado Banana, Beans, snap Cassava Cucumber Eggplant Olive Peppers Potato Pumpkin Sweet potato Tomato Watermelon Yam
11 Ethylene Gas (C 2 H 4 ) Plant hormone involved in many aspects of plant growth and development; directly related to the Climacteric stage of Produce Physiologically active at low concentrations (<0.1ppm) Produced by : Ripening Climacteric Fruit External Contamination Decay Physical Injury
12 Climacteric Characteristics of Produce Definition of Climacteric Climacteric is the stage of fruit ripening associated with ethylene production and a rise in cell respiration. Climacteric fruit ripen with respiration and ethylene bursts; Non-Climacteric fruit have receptors which respond negatively to ethylene gas. The Climacteric event marks: the peak of edible ripeness (best taste & texture) The stage after which fruits are more susceptible to fungal invasion and begin to degrade with cell death.
13 Two Types Of Ethylene-Sensitive Produce Climacteric Apple Banana Pear Peach Kiwifruit Tomato Non-climacteric Cucumber Olive Pea Grape Strawberry Orange
14 USDA Tropical Products Transport Handbook Agriculture Handbook No. 668 Ethylene producers: Apples, apricots, avocados, bananas ripening, cantaloupes, cherimoya, figs, guavas, honeydew, kiwifruit ripe, melons, mamey, mangoes, mangosteen, nectarines, papayas, passion fruit, peaches, pears, persimmons, plantains, plums, prunes, quinces, rambutan, tomatoes. Ethylene sensitive: bananas unripe, Belgian endive, broccoli, brussels sprouts, cabbage, carrots, cauliflower, chard, cucumbers, cut flowers, eggplant, florist greens, green beans, kiwifruit unripe, leafy greens, lettuce, okra, parsley, peas, peppers, potted plants, spinach, squash, sweet potatoes, watercress, watermelon, yams.
15 Effects of Ethylene Gas Exposure to ethylene can: - accelerate senescence, e.g. loss of greenness - accelerate ripening, softening, and discoloration - induce leaf disorders russet spotting in lettuce - induce accumulation of isocoumarin (bitterness in carrots) - induce sprouting (potatoes) - induce toughening of asparagus - cause abscission of flowers
16 Strategy For Ethylene Reduction Minimize Production and Hormonal Action Temperature control; Extend-A-Life Potassium Permanganate Filters; Modified and controlled atmosphere (MA, CA) packaging. Avoidance Ventilation Isolate producers from sensitive product Destruction Chemical, catalytic burners
17 CONCLUSION: Utilize Optimal Preservation Procedures: Reduce Respiration By Maintaining Optimum Temperature Environment ( Cold Chain Management ) Physical Storage Management: Isolate Ethylene Producers from Ethylene Sensitive Produce Filter Ethylene from Storage Spaces Filter/Remove Mold and Fungus Maintain Sanitary Environment
18 References Watkins, C., Vegetable Storage & Cooling 101; Postharvest Handling and Storage 1 &2; Cornell University College of Agriculture & Life Sciences [CBW3@Cornell.edu] Kader A.A. Postharvest Technology of Horticultural Crops. UC Davis Agric. Natl. Res. Pub 3311 USDA, ARS Agriculture Handbook Number 66 The Commercial Storage of Fruits, Vegetables, and Florist and Nursery Stocks Rangarajan A., Bihn, E.A., Gravani, R.B., Scott, D.L., Pritts, M.P. Food safety begins on the farm. A grower s guide. Cornell Good Agricultural Practices Program [eab38@cornell.edu]
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